[@Regitnui]Kandra is 100% okay, though you should pm me your profile first, as being a Kandra is a lot more effective if few know about it. Koloss-blooded or Koloss are totally fine, too, so long as you can play them well. It's more about being able to play the character well than about potentially overpowered races/magic types. Since we're likely in Era 2, we won't have full Mistborn or Full Feruchemists.